Chinese Optics Letters, Volume. 21, Issue 10, 101902(2023)
High energy efficiency soliton microcomb generation in high coupling strength, large mode volume, and ultra-high-Q micro-cavity
Figures & Tables(9)
![Overview of the nonlinear energy conversion efficiency of the DKS combs generated in the different nonlinear material platforms. The references for the comparison include MgF2[15], silica[16], Si3N4[17], LiNbO3[8], and AlN[18].](/Images/icon/loading.gif){kind=icon}
Fig. 2. Nonlinear energy conversion efficiency versus (a) the nonlinear coefficient γ and (b) the power coupling coefficient θ. (c) The input pump power for a silica WGM microcavity with FSR = 21 GHz, β = −150 × 10−27 s2/m, and αi = 0.000025. (d)–(f) Optical spectra for different cavity parameters.
Fig. 3. Evolution of energy conversion efficiency of the DKS comb with the sweeping θ and the corresponding microcavity per round trip loss α.
Fig. 4. (a) Picture of the cavity. (b) Picture of the cavity. (c) Q-factor measurement of the SiO2 microresonator in the time domain.
Fig. 5. Experimental setup for soliton microcombs generation using the ALH method.
Fig. 6. (a) Nonlinear conversion efficiency versus the input power coupling coefficient. (b) The measured cavity transmission at different coupling rates. (c) The measured optical spectra with different coupling rates.
Fig. 7. (a) Nonlinear conversion efficiency in the microcavity with a large coupling strength versus the input power Pin. (b) The measured optical spectrum with Pin = 1.67 dBm.
Fig. 8. Measured optical spectrum of the soliton crystal comb characterized with high energy conversion efficiency.
Table 1. Performances of the Various Nonlinear Materials for Microcomb Generation at
λ ≈ 1.55 µmView tableView in ArticleTable 1. Performances of the Various Nonlinear Materials for Microcomb Generation at
λ ≈ 1.55 µmMaterial Refractive Index n Nonlinear Refractive Index n2 (m2 W−1) Mode Area Aeff (µm2) Nonlinear Coefficient γ (m−1 W−1) D1/2π (GHz) Q Silica microresonator[ 23 ]1.45 2.2 × 10−20 ∼240 3.7159 × 10−4 11.4 2.0 × 109 Silica (wedge disk)[ 24 ]1.45 3 × 10−20 ∼60 0.002 9.3 6.7 × 108 Silica (microtoroid)[ 25 ]1.45 3 × 10−20 ∼10 0.0122 1 THz 1.2 × 108 Si3N4[ 26 ]2.0 2.5 × 10−19 ∼1.5 0.6756 200 3.7 × 107 LiNbO3[ 8 ]2.21 1.8 × 10−19 ∼1 0.7297 199.7 2.2 × 106 AlGaAs[ 27 ]3.3 2.6 × 10−17 ∼0.28 376.4120 1 THz 1.5 × 106 Hydex[ 28 ]1.7 1.15 × 10−19 ∼2 0.1331 200 1.0 × 106 Si[ 29 ]3.47 5 × 10−18 ∼2 10.1314 127 5.9 × 105 GaP[ 30 ]3.05 7.8 × 10−19 ∼0.15 21.0791 500 3 × 105 AIN[ 31 ]2.12 2.3 × 10−19 ∼1 0.9323 NA 9.3 × 105
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Wenwen Cui, Zheng Yi, Xinyu Ma, Yong Geng, Heng Zhou, Kun Qiu. High energy efficiency soliton microcomb generation in high coupling strength, large mode volume, and ultra-high-Q micro-cavity[J]. Chinese Optics Letters, 2023, 21(10): 101902
Paper Information
Category: Nonlinear Optics
Received: Apr. 19, 2023
Accepted: Jun. 9, 2023
Published Online: Oct. 11, 2023
The Author Email: Yong Geng (gengyong@uestc.edu.cn)
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